Straight dope on Civ4:BTS in bullet form for those on the go!
- Unique buildings, new leader traits, new civs, and new leaders add new life and complexity to civ selection.
- Random events are back at long last! Some very interesting, challenging, and rewarding "quest" events such as "build X # of swordsmen in Y time. If successful, all receive free promotion".
- Espionage gets a much needed face lift. Its actually much more useful now, though the "Great Spy" feels like a waste of a Great Person.
- Warlord Great Person is still awesome.
- New wonders and projects to prove your civ is superior to all others.
- Mounted units need their own "barracks" now (stable) which is somewhat annoying.
- Custom games can allow you to put any leader with any civ. An excellent feature given the new depth unique buildings bring to the experience
OVERALL: A very satisfying expansion to the original Civ4 and well worth the money. Those who are "into" Civ, typically keep coming back to the title over time, but this expansion will breathe whole new life into the game.